Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 214: | \[{18^{214}-1\over17}\] | 19 × 643 × 857 × 30817 × 239608739 × 832761290363531<15> × 7731874493772323357347<22> × 69973191647290497588630127823<29> × 540918390282121562487078958501625881<36> × 373822013358964207195535689489923040890019181336423948514739110673<66> × 354891121878588694681349312682405514887073712623527701407655951907915754837692739<81> |